Looks well it would have been nice if there was some study on all airports in Pakistan with the load of planes arrive/ departure
That has already been taken place since 2014!! No one builds new airports or expands existing one's if there is no expected increase in travel, etc, or if there aren't a government's new policies to try to attempt to bring more visitors to the country.
I used to fly to Australia for business, sometimes, I'd take a stop in Dubai for other destinations like India or Pakistan. Guess what? The Dubai airport till 2005 or later, used to be an empty ghost town outside of one or one and a half day of every week. But their government knew they had policies to grow Dubai into a travel and business hub so they created the infrastructure for it. That way, every passenger going through it, would tell others about the infrastructure, like "it feels like a New York in the Middle East", making a lasting impression on others in the West. Today, I don't think Dubai needs any introduction.So a proper infrastructure is absolutely critical to any country's growth.
In the US we say "Presentation is everything". I've seen top companies stocks go up in one day by $ 10 to 50 (times 50 million stocks, get the math), just on a CEO's good presentation, even with normal earnings. I've seen (as recently as last week) stocks drop (with great earnings) by $ 5-10 within hours of a bad presentation by a CEO where he couldn't outline the great earnings correctly and instead, focused more on "future threats", which had nothing to do with that specific day!! So again, presentation is everything. The Infrastructure is your presentation to the remainder of the investors across the globe!
The same case applies here, as the working class go up next year, there would be growth in internal travel, with that, there is a lot of business coming to Pakistan so that would require expanded infrastructure. Next, the government is too focused on making Pakistan terrorism free because they plan to bring Tourists in numbers on packages (like 3 days Dubai, 2 in Karachi or Lahore, etc). That way, slowly, the bad reputation of Pakistani security stuff will go away and tourists will be attracted once again to a "modern and safer Pakistan". But for initial set of tourists to be able to go back and spread the good word, or the business expansion to turn Pakistan into a growing economy, or travelers (internal) to use more air based travel, you need infrastructure. That is what's going on here.